How about using 3 2 foot fixtures like pendants. Grow your SPS directly beneath the lamps and keep the LPS out o the sandbed or between the fixtures?
I didn't think about doing three fixtures...
Do you think it is worth the extra money to do this, if so then yes I can do that. Now there wont be any space between the three they will butt up together, but if I do two three foot fixtures there would be a two foot area that doesn't have direct light over then just the bleed out. I think that might work better.
So its up to you and your madness to design me a awesome light/color combo and I will go with it.
Thanks again